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MOVQ

Copies a quad word operand from the source to the destination.

The following table covers what the source and destinations can be:

DO NOT support LOCK

This instruction is available in 64-bit mode and compatibility mode. In 32-bit mode, the MOVQ mnemonic is typically used for MMX register moves, which behave differently than the General Purpose Register (GPR) moves described here.

When moving an immediate to a register, the immediate MUST be sign-extended to 64 bits. Users MUST ensure that the destination memory address is aligned to a 8-byte boundary to avoid performance penalties or alignment faults in strict environments. Attempting to use MOVQ with an immediate source and a memory destination is #I; a register MUST be used as an intermediary.